This color wheel demonstrates which color a compound will appear if it only has one absorption in the visible spectrum. For example, if the compound absorbs red light, it will appear green. λ absorbed versus color observed 400 nm Violet absorbed, Green-yellow observed (λ 560 nm) 450 nm Blue absorbed, Yellow observed (λ 600 nm) 490 nm Blue-green absorbed, Red observed (λ 620 nm) 570 nm Yellow-green absorbed, Violet observed (λ 410 nm) 580 nm Yellow absorbed, Dark blue observed (λ 430 nm) 600 nm Orange absorbed, Blue observed (λ 450 nm) 650 nm Red absorbed, Green observed (λ 520 nm)
Links to IGCSE Edexcel chemistry
2.1 understand the terms group and period
2.2 recall the positions of metals and non-metals in the Periodic Table
2.3 explain the classification of elements as metals or non-metals on the basis of their electrical conductivity and the acid-base character of their oxides
2.4 understand why elements in the same group of the Periodic Table have similar chemical properties
2.5 understand that the noble gases (Group 0) as a family of inert gases and explain their lack of reactivity in terms of their electronic configurations 2.6 describe the reactions of these elements with water and understand that the reactions provide a basis for their recognition as a family of elements 2.7 describe the relative reactivities of the elements in Group 1 2.8 explain the relative reactivities of the elements in Group 1 in terms of distance between the outer electrons and the nucleus
2.9 recall the colours and physical states of the elements at room temperature
2.10 make predictions about the properties of other halogens in this group
2.11 understand the difference between hydrogen chloride gas and hydrochloric acid
2.12 explain,in terms of dissociation, why hydrogen chloride is acidic in water but not in methylbenzene
2.13 recall the relative reactivities of the elements in Group 7
2.14 describe experiments to show that a more reactive halogen will displace a less reactive halogen from a solution of one of its salts
2.15 understand these displacement reactions as redox reactions
Topic notes
Investigations
Resources
Use webelements to explore trends of various physical properties. Or this one periodic table. for quick revisionAnimations
atomic and ionic radiitransition metals
Power points
Tutorials
Periodicitytrends in successive ionization energies
A level reference material on transition metals
atomic radii
how are the bonds formed in complex ions
different oxidation states of chromium this link will also allow you to go to links for other transition metals.
Complex formationComplexes and colour
Images
Alkali metalsWhich colors are exhibited?
This color wheel demonstrates which color a compound will appear if it only has one absorption in the visible spectrum. For example, if the compound absorbs red light, it will appear green.λ absorbed versus color observed
400 nm Violet absorbed, Green-yellow observed (λ 560 nm)
450 nm Blue absorbed, Yellow observed (λ 600 nm)
490 nm Blue-green absorbed, Red observed (λ 620 nm)
570 nm Yellow-green absorbed, Violet observed (λ 410 nm)
580 nm Yellow absorbed, Dark blue observed (λ 430 nm)
600 nm Orange absorbed, Blue observed (λ 450 nm)
650 nm Red absorbed, Green observed (λ 520 nm)
Links to IGCSE Edexcel chemistry
2.1 understand the terms group and period2.2 recall the positions of metals and non-metals in the Periodic Table
2.3 explain the classification of elements as metals or non-metals on the basis of their electrical conductivity and the acid-base character of their oxides
2.4 understand why elements in the same group of the Periodic Table have similar chemical properties
2.5 understand that the noble gases (Group 0) as a family of inert gases and explain their lack of reactivity in terms of their electronic configurations
2.6 describe the reactions of these elements with water and understand that the reactions provide a basis for their recognition as a family of elements
2.7 describe the relative reactivities of the elements in Group 1
2.8 explain the relative reactivities of the elements in Group 1 in terms of distance between the outer electrons and the nucleus
2.9 recall the colours and physical states of the elements at room temperature
2.10 make predictions about the properties of other halogens in this group
2.11 understand the difference between hydrogen chloride gas and hydrochloric acid
2.12 explain,in terms of dissociation, why hydrogen chloride is acidic in water but not in methylbenzene
2.13 recall the relative reactivities of the elements in Group 7
2.14 describe experiments to show that a more reactive halogen will displace a less reactive halogen from a solution of one of its salts
2.15 understand these displacement reactions as redox reactions
Revision